Thanks for your query.
have you got his test done to find the cause of fever
.Get his blood TLC
.DLC ,CRP.Urine tested and also for malaria
& widal .so exact cause can be known. It can be viral or bacterial infection or even malaria ,so consult some child specialist for exact diagnosis and treatment.
‘Hope I have answered your query, I will be available to answer your follow up queries, “Wish you Good Health and trouble free speedy recovery”